1. Unreasonable assembly of the rolling bearing of the reducer, too tight or too loose fit tolerance
The working efficiency of the rolling bearing of the reducer depends not only on the manufacturing accuracy of the bearing itself, but also on the dimensional accuracy, shape and position tolerance and surface roughness of the shaft and hole that match it, the selected fit and whether the assembly is correct or not.Usually, in a horizontal motor, a well-assembled rolling bearing only bears radial stress, but if the fit between the inner ring of the bearing and the shaft is too tight, or the fit between the outer ring of the bearing and the end cover is too tight, that is, when the tolerance is too large, then after assembly The bearing clearance will become too small, sometimes even close to zero.In this way, the rotation is not flexible, and it will generate heat during operation.If the fit between the bearing inner ring and the shaft is too loose, or the bearing outer ring and the end cover are too loose, then the bearing inner ring and the shaft, or the bearing outer ring and the end cover, will rotate relative to each other, resulting in friction and heat, resulting in bearing failure. overheat.Usually, the tolerance zone of the inner diameter of the bearing inner ring as a reference part is moved below the zero line in the standard, and the tolerance zone of the same shaft forms a fit with the bearing inner ring that is much tighter than that formed with the usual reference hole .
2. The selection of lubricating grease does not meet the standards or the use and maintenance are unreasonable, the quality of the lubricating grease has problems or has deteriorated, or it is mixed with dust and debris, etc., which can cause the bearing to heat up
Adding too much or too little grease will also cause the bearing to heat up, because when there is too much grease, there will be very large friction between the rotating part of the bearing and the grease, and when the grease is added too little, dry friction may occur and heat will occur .Therefore, be sure to adjust the amount of grease so that it is about 1/2-2/3 of the space volume of the bearing chamber.Rinse out the unqualified or deteriorated lubricating grease and replace it with suitable clean lubricating grease.
3. The axial gap between the outer bearing cover of the reducer and the outer circle of the rolling bearing is too small
Large and medium-sized motors usually use ball bearings on the non-shaft end.Roller bearings are used at the shaft end so that the rotor is free to elongate as it heats up and expands.Since ball bearings are used at both ends of small motors, there should be a proper gap between the outer bearing cover and the outer ring of the bearing, otherwise, the bearing may be heated due to excessive thermal elongation in the axial direction.When this happens, the front or rear bearing cover should be removed a little, or a thin paper pad should be placed between the bearing cover and the end cover, so that a sufficient gap is formed between the outer bearing cover at one end and the outer ring of the bearing. Clearance.
4. The end covers or bearing covers on both sides of the reducer are not installed properly
If the end covers or bearing covers on both sides of the reducer are not installed in parallel or the seams are not tight, the balls will deviate from the track and rotate to generate heat.Be sure to reinstall the end caps or bearing caps on both sides to level up, and use the bolts to rotate evenly to fix them.
5. Balls, rollers, inner and outer rings, and ball racks are severely worn or metal peeling off
This should update the bearings.
6. Poor connection with load machinery.
Including: poor assembly of the coupling, excessive pull of the belt, inconsistency with the shaft center of the load machine, too small diameter of the pulley, too far away from the bearing of the pulley, excessive axial or radial load, etc.
Correct unreasonable connections to prevent bearings from carrying abnormal forces.
7. The shaft is bent
At this time, the force on the bearing is no longer a pure radial force, which causes the bearing to heat up.Find a way to straighten the bent shaft or replace it with a new one.
